#include "drivers/REGX52.H"
#include "Delay.H"
unsigned char MaxtrixKey() {

	unsigned char KeyNumber=0;
	P1=0xFF;
	P1_3=0; 
	if(P1_7==0){Delay(20);while (P1_7==0);Delay(20);KeyNumber=1;}
	if(P1_6==0){Delay(20);while (P1_6==0);Delay(20);KeyNumber=5;}
	if(P1_5==0){Delay(20);while (P1_5==0);Delay(20);KeyNumber=9;}
	if(P1_4==0){Delay(20);while (P1_4==0);Delay(20);KeyNumber=13;}

    P1=0xFF;
    P1_2=0;
    if(P1_7==0){Delay(20);while (P1_7==0);Delay(20);KeyNumber=2;}
    if(P1_6==0){Delay(20);while (P1_6==0);Delay(20);KeyNumber=6;}
    if(P1_5==0){Delay(20);while (P1_5==0);Delay(20);KeyNumber=10;}
    if(P1_4==0){Delay(20);while (P1_4==0);Delay(20);KeyNumber=14;}

    P1=0xFF;
    P1_1=0;
    if(P1_7==0){Delay(20);while (P1_7==0);Delay(20);KeyNumber=3;}
    if(P1_6==0){Delay(20);while (P1_6==0);Delay(20);KeyNumber=7;}
    if(P1_5==0){Delay(20);while (P1_5==0);Delay(20);KeyNumber=11;}
    if(P1_4==0){Delay(20);while (P1_4==0);Delay(20);KeyNumber=15;}

    P1=0xFF;
    P1_0=0;
    if(P1_7==0){Delay(20);while (P1_7==0);Delay(20);KeyNumber=4;}
    if(P1_6==0){Delay(20);while (P1_6==0);Delay(20);KeyNumber=8;}
    if(P1_5==0){Delay(20);while (P1_5==0);Delay(20);KeyNumber=12;}
    if(P1_4==0){Delay(20);while (P1_4==0);Delay(20);KeyNumber=16;}
	return KeyNumber;

}